/*
 * Copyright 2012 Mojing.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package main;

import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.parser.HtmlParseData;
import edu.uci.ics.crawler4j.url.WebURL;
import java.util.List;
import java.util.regex.Pattern;

/**
 *
 * @author Mojing
 */
public class pcrawl extends WebCrawler {

        private final static Pattern FILTERS = Pattern.compile(".*(\\.(css|js|bmp|gif|jpe?g" 
                                                          + "|png|tiff?|mid|mp2|mp3|mp4"
                                                          + "|wav|avi|mov|mpeg|ram|m4v|pdf" 
                                                          + "|rm|smil|wmv|swf|wma|zip|rar|gz))$");

        /**
         * You should implement this function to specify whether
         * the given url should be crawled or not (based on your
         * crawling logic).
         */
        @Override
        public boolean shouldVisit(WebURL url) {
                String href = url.getURL().toLowerCase();
                return !FILTERS.matcher(href).matches() && href.startsWith("http://www.ics.uci.edu/");
        }

        /**
         * This function is called when a page is fetched and ready 
         * to be processed by your program.
         */
        @Override
        public void visit(Page page) {          
                String url = page.getWebURL().getURL();
                System.out.println("URL: " + url);

                if (page.getParseData() instanceof HtmlParseData) {
                        HtmlParseData htmlParseData = (HtmlParseData) page.getParseData();
                        String text = htmlParseData.getText();
                        String html = htmlParseData.getHtml();
                        List<WebURL> links = htmlParseData.getOutgoingUrls();

                        System.out.println("Text length: " + text.length());
                        System.out.println("Html length: " + html.length());
                        System.out.println("Number of outgoing links: " + links.size());
                }
        }
}
